the playground/cold/it/Was/at? -No, it wasn't. * on the swings/were/the girls/? -Yes, they were. * on the desk/Were/her books? -No,they weren't. *

Was it cold at the playground? - No, it wasn't

Were the girls on the swings? - Yes, they were

Were her books on the desk? - No, they weren't

При построении вопросительных предложений на первое место ставится вспомогательный глагол (в данном случае - was/were), на второе - подлежащее (в данном случае - it/the girls/her books), а в конец - обстоятельство.